Fennitisation surrounding the Wadi Tarr Albitite, Egypt
The migration of carbonate-rich solutions was common during deformation and metamorphism of the Arabian-Nubian Shield (ANS), forming veins and dikes, and causing diffuse and pervasive carbonation of a wide range of basement rocks. The sources of carbonate are controversial and have been suggested to include remobilized carbonate sediments, carbonatite melts, and cooling silicate melts. A classic example of the intrusive carbonate rocks in the ANS occurs in Wadi Tarr, southern Sinai. The Tarr albitite-carbonate complex occurs as small (<1.2 km2) albitite plutons with associated veins and dykes of intrusive carbonate that intrude metasedimentary and metavolcanic country rocks. The albitite is surrounded by a zone of brecciation and fenitic alkali metasomatism of the surrounding country rocks. This study investigates the mineralogy and chemical composition of the fenitisation zone, and its genetic association with albitites and intrusive carbonates at Wadi Tarr, southern Sinai, Egypt.
Pitcairn, I.K., Azer, M.K., Hassan, F., Stern, R.J. (2010) Hydrothermal alteration during intrusion of the Tarr albitite-carbonatite complex Southern Sinai, Egypt. Saudi Geological Survey Technical Report SGS-TR-2010-2, p.52–55